Allen Bradley 1402-LS51 Line Synchronization Module

FAQ

Q1. What is the Allen‑Bradley 1402‑LS51 used for?
It is a line synchronization module that aligns voltage, frequency, and phase between separate three‑phase power systems for coordinated control.

Q2. Which hardware does this module fit into?
It installs in a standard 1771 I/O chassis used with Allen‑Bradley PLC‑5 systems.

Q3. What electrical inputs does the 1402‑LS51 support?
The module operates on 120 VAC, handles up to 5 A RMS continuous current, and can tolerate 200 A RMS for 1 second peaks.

Q4. What are its physical dimensions and weight?
Approximate dimensions are 254 × 148 × 62 mm with a weight around 3.35–3.44 kg (~7.4–7.6 lbs).

Q5. Is the module still in production?
No — the 1402‑LS51 is considered a discontinued / legacy product and is usually available through surplus and refurbish suppliers.

Q6. Does this module require special cooling or enclosure conditions?
It is designed for standard industrial PLC cabinets; normal ventilation and ambient operating conditions (0 °C to 60 °C) should be maintained.

Q7. Can it monitor load sharing and synchronization status?
Yes — it provides synchronization feedback like voltage/frequency within limits and phase alignment status for connected systems.

Q8. How many chassis slots does it occupy?
The 1402‑LS51 occupies two adjacent slots in the 1771 I/O chassis.

1402-LS51 Allen Bradley

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